Aliasing girl_with_hair_over_one_eye_(k-on!) -> kinoshita_shizuka.
Aliasing girl_with_exchange_diary_(k-on!) -> chika_(k-on!).
Aliasing sasaki_(k-on!) -> sasaki_youko
Reason: Given recent episodes of K-ON!!, it looks like a lot of the classmates are getting confirmed due to the subtitles since several had a chance to speak (and there's also a few even get mentioned by name in the dialogue). The first appears to have her full name thanks to a comment from the director in the staff commentary (assuming from Vol. 1 extras) where her family name was mentioned and her seiyuu Kataoka Azusa's blog The others are directly from the closed captioning in ep. 18 as is the usual case.
Updated by jxh2154